From: Monnoyer Philippe (monnoyer@imec.be)
Date: 09/18/02-05:28:13 AM Z
If hydrogen peroxide goes together with acetic acid in the fix, this will make sulfurous acid from thiosulfate. This is certainly the cause of an awful strong smell. Now is sulfurous acid and sulfur dioxyde (gas coming from it) toxic ... I think so, but not extremely I would say. You'd better check the MSDS for those chemicals.
Usually when fix smell ugly and irritant, this is the reason. When mixed with acid for example.
Cheers,
Philippe
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Philippe Monnoyer, Ph.D.
Silicon Process and Device Technology
IMEC vzw
Kapeldreef, 75
B-3001 Leuven
Phone: +32 (0)16 28 17 35
Fax: +32 (0)16 28 12 14
http://www.imec.be
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|-----Original Message-----
|From: Christina Z. Anderson [mailto:zphoto@montana.net]
|Sent: Wednesday, September 18, 2002 05:50
|To: Alt Photo List
|Subject: smelly question
|
|
|Here's another chemistry query. OK, I"m doing mordancage with copper
|chloride, acetic acid, and hydrogen peroxide. When I put the
|print in fix,
|it stinks something horrible. Did we figure out a while back
|that it would
|be hydrogen sulfide, or would the hydrogen peroxide have
|dissipated by then,
|being that I washed the print for a while after developing,
|and therefore
|the smell is resulting from some other combo? And, with photo
|chems (aside
|from mercury and selenium, amidol and pyro perhaps, and
|dichromates) are
|there chems that you all worry about *breathing*? I don't
|mind smell if
|it's not toxic (e.g. sulfide toners).
|Chris
|
|
|
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